Lens for primarily-elongate light distribution

A lens for distribution of light from a light emitter having an axis, the lens comprising:

• a refracting inner surface defining an inner cavity with a closed-perimeter opening defined in a base plane by substantially straight edge portions each adjoining a pair of curved edge portions, the refracting inner surface extending from the opening to terminate at a refracting inner end surface transverse the axis;
• a refracting main output surface transverse the axis and having front and back edges and a pair of lateral edges therebetween;
• a pair of refracting lateral output surfaces each extending from one of the main-output-surface lateral edges toward the base plane, the lateral output surfaces being configured to refract a portion of lateral light away from the axis;
• and
• a reflecting surface positioned outwardly of and around the inner surrounding surface to receive substantially all forward and rearward light and a base-plane-adjacent portion of lateral light refracted by the inner surrounding surface for total internal reflection (TIR) toward the main output surface.